Pointing Pair

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Pointing Pair
When a specific candidate value inside a box is restricted to one row or column, you can use the Pointing Pair technique. This means that you can exclude the same candidate value from other boxes in the same row or column.

In the example on the right, the top box has two cells containing a candidate 3 in its left column. These candidate values are in the same row or column. Because one of those cells must be a 3, the cells in that column outside this box cannot be a 3. Therefore candidate value 3 can be excluded from the yellow cell.
Pointing Pair example